Mesosaurs (`middle lizards`) were a group of small aquatic reptiles that lived during the early Permian period, roughly 299 to 270 million years ago. Mesosaurs were the first aquatic reptiles, having apparently returned to an aquatic lifestyle from more terrestrial ancestors. However, just how terrestrial mesosaur ancestors had become remains un.....
Found on
http://en.wikipedia.org/wiki/Mesosaur
(from the article `reptile`) ...on pterygoid (a bone of the palate); a lateral temporal fenestra (between jugal and squamosal) in some advanced forms. Mostly small and ...
Found on
http://www.britannica.com/eb/a-z/m/77
No exact match found.
